July 11, 2025, marked the celebration of the completion of the Log Wall, a historic drylaid stone wall, stabilization near the Carderock Recreation Area. This major $11.4M infrastructure project was made possible through the Great American Outdoors Act (GAOA) Legacy Restoration Fund. The stabilization focused on an approximately 1,015 linear foot long historic drylaid stone wall, which varies in height up to 35 feet tall. The wall was originally constructed between 1828 and 1831 and is often referred to as the “Log Wall,” as found in an 1890 Engineer’s Report.
The project began in 2023, following the formation of sinkholes in 2015 and 2016 above the Log Wall. These sinkholes led to the dewatering and sandbagging of the canal to preserve its structural integrity. The resulting damage left a vital section of the towpath at risk of failure, disrupting the park’s continuity and recreational opportunities. Additionally, the sinkholes increased the vulnerability of the Potomac Interceptor Combined Sewer to potential failures. Installed in the 1960s, this sewer system transports approximately 60 million gallons of combined sewage daily beneath the towpath to a treatment facility in Washington, D.C. A failure of the Log Wall could result in a leak or break in the sewer system, potentially releasing 60 million gallons of raw, untreated sewage into the Potomac River, causing widespread catastrophic damage to the ecosystem and human health.
Photo credit: NPS
Photo by Trust Staff
Photo by Francis Grant-Suttie
Photo by Francis Grant-Suttie
Photo by Trust Staff
We’re bringing back our TowpathGO 5K, and this spring it’s coming to Williamsport! Join us May 6 for Racin’ the Basin. The 5K will start at 7 a.m. at Cushwa Basin, prior to our Canal Community Days cleanup.
